it's a new sign that the obama administration is taking those threats seriously. grant lodes is here to show us how the missile defense system is supposed to work. and why some people think it won't. grant? >> the idea is to intercept incoming warheads in space, before they re=enter the atmosphere. thirty of the missiles are currently deployed, four at vandenberg air force base in california, and the rest at fort greely, near fairbanks, alaska. today defense secretary chuck hagel says fourteen more missiles will be addied in the next few years. we do not want to take any chances and to stay ahead of the threat. if there is ever a missile attack on the u=s, this is what is supposed to stop it. the pentagon calls it ground-based midcourse defense, designed to intercept incoming warheads in space, before they re=enter the atmosphere. thirty of the missiles are currently deployed, four at vandenberg air force base in california, and the rest at fort greely, near fairbanks, alaska. today defense secretary chuck hagel says fourteen more missiles will be addied in the ne